Beginning in the Late 1980s,drug Use Declined Significantly Among Middle-Class

question 30

True/False

Beginning in the late 1980s,drug use declined significantly among middle-class people,but declined much more slowly among poor people.

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Definitions:

Fetus

A developing human from roughly eight weeks after conception to birth.

Genome

The complete instructions for making an organism, consisting of all the genetic material in that organism’s chromosomes.

Embryo

An early stage of development in multicellular organisms, in humans, it refers to the period from fertilization until about the eighth week of gestation.

Zygote

The earliest cellular stage in embryonic development, resulting from the fertilization of an egg by a sperm.